Blanding City No. 3 Reservoir Report

Last Updated: December 5, 2025

Blanding City No.


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Summary

3 is a vital water resource infrastructure located in San Juan County, Utah, serving its primary purpose of irrigation. Managed by the local government, this earth dam stands at a height of 47 feet and was completed in 1961. With a storage capacity of 320 acre-feet and a normal storage of 250 acre-feet, it plays a crucial role in sustaining agricultural activities in the region.

Situated along Johnson Creek, this dam is regulated by the Utah Division of Water Rights and undergoes regular inspections to ensure its structural integrity. With a high hazard potential but a satisfactory condition assessment as of 2011, Blanding City No. 3 is an essential component of the local water infrastructure. Its location, just 4 miles from Blanding city, underscores its significance in managing water resources and mitigating the impacts of climate variability in the region.

As water resource and climate enthusiasts, understanding the operational and regulatory aspects of structures like Blanding City No. 3 provides valuable insights into the challenges and opportunities in sustainable water management. With its historical significance and ongoing role in supporting agricultural activities, this dam exemplifies the intersection of infrastructure, environmental stewardship, and community resilience in the face of changing climatic conditions.

Year Completed

1961

Dam Length

990

River Or Stream

JOHNSON CREEK - OFFSTREAM

Primary Dam Type

Earth

Hydraulic Height

47

Drainage Area

0.6

Nid Storage

320

Structural Height

47

Hazard Potential

High

Nid Height

47
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.